package com.heima.media.interceptor;

import com.heima.common.dto.User;
import com.heima.common.util.MediaThreadLocalUtil;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//               从请求头中获取userIUd
        String userId = request.getHeader("userId");
//               如果userID存在，将用户信息放到ThreadLocal中
        if (!StringUtils.isEmpty(userId)){
            User user = new User();
            user.setUserId(Integer.parseInt(userId));
            MediaThreadLocalUtil.set(user);
        }
//        App端有一些操作不需要登录，所以这里始终放行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//                释放ThreadLocal中的数据，防止内存泄漏
        MediaThreadLocalUtil.remove();
    }
}
